| Jess B. Williams Unit A O-2-10261 | Verdun Oil & Gas LLC only | Eagleville (Eagle Ford-2) | Karnes | 4 | 1.04M | 2.78M | Jul 2012 – Jul 2026 |
| Williams Unit B 24-13 O-10-46464 | Surge Operating, LLC only | Spraberry (Trend Area) | Howard | 4 | 735K | 1.13M | Sep 2014 – Jul 2026 |
| Clyde Williams Unit O-3-25875 | Wildfire Energy Operating LLC only | Madisonville, W. (Woodbine -A-) | Robertson | 4 | 588K | 138K | Feb 2012 – Jul 2026 |
| Aline Williams Unit A O-1-15831 | Crescent Energy Operating, LLC only | Briscoe Ranch (Eagleford) | Frio | 3 | 536K | 605K | Nov 2011 – Jul 2026 |
| Williams Unit O-10-49682 | Strawn Petroleum Operating, LLC only | Garden City, S. (Wolfcamp) | Scurry | 1 | 399K | 1.58M | Nov 2016 – Jul 2026 |
| Williams Unit a 24-13 O-10-52037 | Surge Operating, LLC only | Spraberry (Trend Area) | Howard | 3 | 390K | 731K | Jan 2019 – Jul 2026 |
| Turk-Williams Unit O-1-15938 | Marathon Oil EF LLC only | Eagleville (Eagle Ford-1) | Gonzales | 2 | 326K | 458K | May 2012 – Jul 2026 |
| Williams Unit O-1-16426 | Murphy Expl. & Prod. Co. - USA only | Eagleville (Eagle Ford-1) | Atascosa | 3 | 296K | 270K | Dec 2012 – Jul 2026 |
| Nancy K. Williams Unit A O-2-10513 | Verdun Oil & Gas LLC only | Eagleville (Eagle Ford-2) | Karnes | 1 | 149K | 318K | Jan 2013 – Jul 2026 |
| Weeber-Williams Unit O-3-22495 | Wildfire Energy Operating LLC only | Giddings (Austin Chalk-3) | Burleson | 1 | 142K | 48.2K | Aug 1994 – Jul 2026 |
| McWilliams Unit O-3-21891 | 7711 Corporation, The only | Giddings (Austin Chalk-3) | Brazos | 1 | 137K | 368K | Jan 1993 – Sep 2010 |
| Williams Unit 49A O-10-45454 | New Height Energy, LLC only | Spraberry (Trend Area) | Howard | 1 | 109K | 351K | Feb 2011 – Jul 2026 |
| Williams Unit 49 O-10-40176 | New Height Energy, LLC only | Spraberry (Trend Area) | Howard | 2 | 102K | 302K | Apr 2010 – Jul 2026 |
| Ermis-Williams Unit O-3-21801 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk-3) | Fayette | 1 | 102K | 265K | Jan 1993 – Jul 2026 |
| Palmer-Williams Unit O-3-25108 | Wildfire Energy Operating LLC only | Giddings (Austin Chalk-3) | Burleson | 1 | 51.3K | 51.7K | Nov 2007 – Jul 2026 |
| Williams Unit O-3-26102 | Houston Petroleum Company only | Algoa ( 32, 9400) | Galveston | 1 | 36K | 1.79K | Jan 2013 – Nov 2017 |
| A. M. Williams Unit 2 O-3-23931 | Impetro Operating LLC only | Kurten (Woodbine) | Brazos | 1 | 17.5K | 0 | Sep 2000 – Jun 2015 |
| Sparks-Williams Unit O-6-12173 | Bowles Energy, Inc. only | Carthage (Fogle 6545) | Harrison | 1 | 14.5K | 98 | Jan 1993 – Sep 2014 |
| Williams Unit O-3-27555 | Elliott Oil & Gas Operating Co. only | Algoa ( 32, 9400) | Galveston | 1 | 12.7K | 0 | May 2018 – Jul 2026 |
| Christie-Williams Unit O-8-6209 | D.J. & T. Energy only | Stephens County Regular | — | 1 | 10.8K | 125K | Jan 1993 – Jul 2026 |
| Williams Unit O-1-4776 | Aaronmark Services, LLC only | Patty Hutt (Wilcox) | — | 2 | 9.09K | 19 | Jan 1993 – Jul 2026 |
| C. L. Williams Unit O-11-70075 | Brown, Geo. R Partnership,lp,the only | MWH (Strawn) | Garza | 1 | 7.7K | 0 | Mar 2013 – Jul 2026 |
| Daugherty-Williams Unit O-11-68842 | Chisholm Operating, Inc. only | Trifecta (Croton Lime) | Dickens | 1 | 2.13K | 0 | Oct 2005 – Apr 2015 |
| Anderson-Cooper-Williams Unit O-13-32822 | Brigadier Operating, LLC only | KRS (Marble Falls) | Jack | 1 | 1.36K | 101K | Sep 2013 – Mar 2016 |
| Williams Unit O-6-13986 | Tex-OK Energy, Ltd Partnership only | Whelan (Travis Peak) | Harrison | 1 | 447 | 1.18K | Jan 2000 – Dec 2010 |
| C L Williams Unit O-11-69984 | Brown, Geo. R Partnership,lp,the only | Aljenda - BLP (Ellenburger) | Garza | 1 | 48 | 0 | Dec 2012 – Jan 2014 |
| Williams Unit G-13-241239 | XTO Energy Inc. only | Newark, East (Barnett Shale) | Parker | 1 | 0 | 96.3K | Mar 2008 – Mar 2015 |
| Macwilliams Unit G-13-52845 | Rover Operating Company, LLC only | Young County Regular (Gas) | — | 1 | 0 | 42.4K | Jan 1993 – Jul 2026 |
| Williams Unit O-2-481 | Anico Six Sixty Six only | Francitas, North | — | 1 | 0 | 0 | Jan 1993 – Aug 2003 |
| Williams Unit G-8-154013 | Western Reserves Corporation only | Dillon (Strawn) | Parker | 1 | 0 | 0 | Mar 1994 – Jun 1997 |
| Williams Unit A-539 G-6-154487 | Union Pacific Resources Company only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 0 | 87.7K | Sep 1994 – Nov 1996 |
| Williams Unit G-6-133801 | Thunderbird (Texas) Resources LP only | Briggs (Upper Travis Peak) | Panola | 1 | 0 | 29.4K | Jan 1993 – Feb 2016 |
| Williams Unit G-6-132449 | Thunderbird (Texas) Resources LP only | Timmins (Travis Peak, Lower) | Panola | 1 | 0 | 0 | Jan 1993 – Feb 2016 |
| Williams Unit G-6-86850 | Tex-OK Energy, Ltd Partnership only | Whelan (Cotton Valley) | Harrison | 1 | 0 | 2.03K | Jan 1993 – Apr 2010 |
| A. Williams Unit G-6-29362 | CR2 Energy LLC only | Bethany (Pettit) | — | 1 | 0 | 185K | Jan 1993 – Jul 2026 |
| Williams Unit G-3-282549 | Frio Operations, Inc. only | Algoa ( 32, 9400) | Galveston | 1 | 0 | 187K | Mar 2017 – Oct 2019 |
| Williams Unit G-3-236004 | Evolution Operating Co., Inc. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 0 | 294K | Mar 2008 – Oct 2013 |
| Williams Unit G-3-190250 | Evolution Operating Co., Inc. only | Navasota River (Cretaceous Lwr.) | Brazos | 1 | 0 | 201K | May 2002 – Mar 2008 |
| McWilliams Unit G-3-168399 | Expro Engineering, Inc. only | Bay City, East (10,000 A) | Matagorda | 1 | 0 | 267K | Mar 1998 – Dec 2006 |
| McWilliams Unit G-3-140772 | Expro Engineering, Inc. only | Bay City, East (10,000 B) | Matagorda | 1 | 0 | 637K | Jan 1993 – Mar 1999 |
| Jim L. Williams Unit O-6-13491 | Fair Oil, LC only | Green Fox (Pettit 6200) | Marion | 1 | 0 | 0 | Dec 1995 – Aug 1999 |
| Williams Unit G-3-127301 | Daylight Petroleum LLC only | Lake Creek (Wilcox Consolidated) | Montgomery | 1 | 0 | 727K | Jan 1993 – Dec 2023 |
| Williams Unit G-2-274197 | Marquee Corporation only | Mauritz, West (5600 Frio) | Jackson | 1 | 0 | 16.2K | Apr 2014 – Jun 2015 |
| Williams Unit G-2-259607 | Suncoast Technical Services Inc only | Hope (Miocene 2750) | Lavaca | 1 | 0 | 37.1K | Apr 2010 – Oct 2012 |
| Williams Unit G-2-249868 | Suncoast Technical Services Inc only | Hope (Miocene 3050) | Lavaca | 1 | 0 | 25.4K | Apr 2009 – Oct 2012 |
| Williams Unit G-2-245919 | Suncoast Technical Services Inc only | Brushy Creek, North (Frio 2750) | Lavaca | 1 | 0 | 46.5K | Jul 2008 – Jun 2011 |
| Williams Unit G-2-245339 | Suncoast Technical Services Inc only | Hope (Frio 3079) | Lavaca | 1 | 0 | 16.8K | Jun 2008 – Apr 2009 |
| Williams Unit G-2-242631 | Suncoast Technical Services Inc only | Brushy Creek (Frio 2760) | Lavaca | 1 | 0 | 124K | Dec 2007 – Mar 2011 |
| Ben Williams Unit G-2-113113 | American Int'l Energy Corp. only | Cologne (4110) | Victoria | 1 | 0 | 0 | Jan 1993 – May 1999 |
| Ima Williams Unit O-13-31414 | EOG Resources, Inc. only | Newark, East (Barnett Shale) | Montague | 1 | 0 | 0 | Jun 2009 – Feb 2015 |